Yang-Mills set of Dyson-Schwinger equations can be solved through a class of exact solutions of the 1-point function, similarly to the \(\phi ^4\)  theory [1]}. The spectrum can be obtained as well and appears in agreement with lattice data [2]}. Adding quarks to the theory makes it unsolvable but, also in this case, our approach could be proven meaningful to derive the proper low energy limit of QCD.
